diff --git a/tests/test_interop_bridge.py b/tests/test_interop_bridge.py
new file mode 100644
index 0000000..5eee01d
--- /dev/null
+++ b/tests/test_interop_bridge.py
@@ -0,0 +1,29 @@
+import time
+
+from nova_plan.planner import LocalProblem
+from nova_plan.contracts import PlanDelta
+from nova_plan.interop_catopt import local_to_canon, canon_delta_to_morphism
+from nova_plan.catopt_bridge import ObjectI, Morphism
+
+
+def test_local_to_canon_wrapper_returns_objectI():
+    lp = LocalProblem(
+        id="interop-agent",
+        objective=lambda v, s: sum(v.values()) + sum(s.values()),
+        variables={"x": 3.0},
+        constraints={},
+    )
+    obj = local_to_canon(lp)
+    assert isinstance(obj, ObjectI)
+    assert obj.id == "interop-agent"
+    assert "variables" in obj.payload
+
+
+def test_canon_delta_from_plan_delta():
+    d = PlanDelta(agent_id="interop-agent", delta={"x": 0.25}, timestamp=time.time())
+    m = canon_delta_to_morphism(d)
+    assert isinstance(m, Morphism)
+    assert m.source == "interop-agent"
+    assert m.target == "global"
+    assert m.data == {"x": 0.25}
+    assert m.contract_id == "default"